FI961279A0 - Chlorine-free chemical pulp bleaching comprising a two-stage treatment with chelating agent - Google Patents

Chlorine-free chemical pulp bleaching comprising a two-stage treatment with chelating agent

Info

Publication number
FI961279A0
FI961279A0 FI961279A FI961279A FI961279A0 FI 961279 A0 FI961279 A0 FI 961279A0 FI 961279 A FI961279 A FI 961279A FI 961279 A FI961279 A FI 961279A FI 961279 A0 FI961279 A0 FI 961279A0
Authority
FI
Finland
Prior art keywords
chlorine
chelating agent
chemical pulp
stage treatment
pulp bleaching
Prior art date
Application number
FI961279A
Other languages
Finnish (fi)
Swedish (sv)
Other versions
FI961279A (en
Inventor
Maorten Dahl
Solveig Norden
Original Assignee
Sunds Defibrator Ind Ab
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sunds Defibrator Ind Ab filed Critical Sunds Defibrator Ind Ab
Publication of FI961279A publication Critical patent/FI961279A/en
Publication of FI961279A0 publication Critical patent/FI961279A0/en

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/1026—Other features in bleaching processes
    • D21C9/1042—Use of chelating agents
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/147—Bleaching ; Apparatus therefor with oxygen or its allotropic modifications
    • D21C9/153—Bleaching ; Apparatus therefor with oxygen or its allotropic modifications with ozone
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/16—Bleaching ; Apparatus therefor with per compounds
    • D21C9/163—Bleaching ; Apparatus therefor with per compounds with peroxides

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
FI961279A 1993-09-21 1996-03-20 Chlorine-free chemical pulp bleaching comprising a two-stage treatment with chelating agent FI961279A0 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9303066A SE501836C2 (en) 1993-09-21 1993-09-21 Bleaching of chemical pulp whereby the pulp is treated with complexing agents before and after an ozone step
PCT/SE1994/000758 WO1995008666A1 (en) 1993-09-21 1994-08-22 Chlorine-free bleaching of chemical pulp involving a two stage treatment with chelating agent

Publications (2)

Publication Number Publication Date
FI961279A FI961279A (en) 1996-03-20
FI961279A0 true FI961279A0 (en) 1996-03-20

Family

ID=20391160

Family Applications (1)

Application Number Title Priority Date Filing Date
FI961279A FI961279A0 (en) 1993-09-21 1996-03-20 Chlorine-free chemical pulp bleaching comprising a two-stage treatment with chelating agent

Country Status (9)

Country Link
EP (1) EP0720675A1 (en)
JP (1) JPH09503028A (en)
AU (1) AU7792394A (en)
BR (1) BR9407555A (en)
CA (1) CA2168445A1 (en)
FI (1) FI961279A0 (en)
NO (1) NO961139D0 (en)
SE (1) SE501836C2 (en)
WO (1) WO1995008666A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE504803C2 (en) * 1995-08-24 1997-04-28 Sunds Defibrator Ind Ab Treatment of pulp with complexing agents in at least two mixing steps without intermediate washing
SE508239C2 (en) * 1997-01-03 1998-09-21 Sunds Defibrator Ind Ab Treatment of pulp with complexing agents in at least one mixing step, without the use of the bleaching tower
CN102587186B (en) * 2012-03-20 2015-03-11 昆明理工大学 Method for bleaching dendrocalamus giganteus chemical pulp
RU2634586C1 (en) * 2016-08-01 2017-10-31 федеральное государственное бюджетное образовательное учреждение высшего образования "Пермский национальный исследовательский политехнический университет" Method of bleaching hardwood sulphate cellulose

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002517173A (en) * 1991-01-03 2002-06-11 ユニオン キャンプ パテント ホウルディング インコーポレイテッド Bleaching method of lignocellulose pulp without chlorine
SE468355B (en) * 1991-04-30 1992-12-21 Eka Nobel Ab CHEMISTRY OF CHEMICAL MASS THROUGH TREATMENT WITH COMPLEX PICTURES AND OZONE

Also Published As

Publication number Publication date
NO961139L (en) 1996-03-20
AU7792394A (en) 1995-04-10
SE9303066L (en) 1995-03-22
WO1995008666A1 (en) 1995-03-30
CA2168445A1 (en) 1995-03-30
JPH09503028A (en) 1997-03-25
BR9407555A (en) 1996-12-31
FI961279A (en) 1996-03-20
SE501836C2 (en) 1995-05-22
EP0720675A1 (en) 1996-07-10
SE9303066D0 (en) 1993-09-21
NO961139D0 (en) 1996-03-20

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